Zip Code 15857 — Saint Marys, PA
15857 is a ZIP Code associated with Saint Marys, PA, located within Elk. 15857 ranks #1 out of 12 ZIP codes in Elk County by population (and #340 out of 1,832 in PA). The area supports an estimated population of 12,736 residents across Data Pending housing units, with a population density of 48.9 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (41.456710, -78.534390)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 15857 |
| Primary City | Saint Marys |
| State / Province | PA |
| County | Elk |
| Total Population | 12,736 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 48.9 people/sq mi |
| Timezone | America/New_York |
How 15857 Compares
| Metric | ZIP 15857 | Elk County | PA State Average |
|---|
| Population | 12,736 | 30,328 (Total) | 13,018,637 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 48.9 /sq mi | -- | -- |
| County Pop Rank | #1 of 12 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →